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CAIE IGCSE Biology 22.1.7 Solve Qualitative and Quantitative Problems Questions

Practise solving unfamiliar biology problems by combining data, calculations, units and justified conclusions across experimental and real-world contexts.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • choose a biological variety or treatment by comparing supplied performance data
  • calculate a total from repeated rates, duration and expansion values with working
  • calculate percentage change and round to two significant figures
  • test a hypothesis by calculating normalized rates and stating a supported conclusion
  • estimate a biological quantity from a scale or ratio and show working

CAIE IGCSE Biology 22.1.7 Solve Qualitative and Quantitative Problems Questions question 1

[Maximum number: 3]

Fig. 4.1 is a diagram of a virus.

Fig. 4.1

Fig. 4.1

The human immunodeficiency virus (HIV) infects and destroys lymphocytes.

The number of lymphocytes in the blood of a person infected with HIV was measured over a period of 84 months.

The results are shown in Fig. 4.2.
number of lymphocytes per mm3\mathrm{mm}^{3} of blood

Fig. 4.2

Fig. 4.2

Use the information shown in Fig. 4.2 to calculate the percentage change in the number of lymphocytes from month 10 to month 60.
Give your answer to two significant figures.
.

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